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Scanning head with 128-element 20-MHz PVDF linear array transducer.

Stephen J Carey¹, Christian Brox-Nilsen, Hugh M Lewis

¹University of Manchester, Department of Electrical and Electronic Engineering, Manchester, UK. s.carey@manchester.ac.uk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|August 19, 2009

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This study presents a novel ultrasound scanning head with a 128-element transducer, achieving 40 µm axial resolution. The system demonstrates high performance and low power consumption for advanced imaging applications.

Area of Science:

Ultrasound Technology
Biomedical Engineering
Materials Science

Background:

Advanced ultrasound imaging requires high-resolution transducers.
Existing systems may face limitations in resolution, power, or size.

Purpose of the Study:

To design and fabricate a compact ultrasound scanning head.
To achieve high axial and lateral resolution for detailed imaging.
To evaluate the performance and power efficiency of the developed system.

Main Methods:

A 20-MHz, 128-element linear transducer array was fabricated using 28 µm PVDF film.
Custom pulsers (-200 V) and a 16-channel amplifier were integrated.
Transducer characteristics (pulse length, noise pressure, radiated power) were measured.

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Imaging tests were performed to determine axial and lateral resolution.

Main Results:

The transducer exhibited an average -20 dB pulse length of 69 ns.
Equivalent noise pressure was measured at 7.5 mPa/√Hz.
Radiated power level reached approximately 1 MPa with 32 pulsed elements.
Achieved axial resolution of 40 µm and lateral resolution of 0.2 mm.
The scanning head dissipated 1.6 W at 750 Hz pulse repetition rate.

Conclusions:

The designed scanning head integrates a high-frequency linear array for superior resolution.
The system demonstrates efficient operation with low power dissipation.
This technology holds promise for enhanced ultrasound imaging applications.